Recent content by Asmaa Mohammad

Hello, During the procedure of radiography using x-rays, scatter radiation occurs, due to the difference in densities of the object being radiographed. That scatter radiation causes fogging (noise) of the film, i.e. the contrast of the film is reduced due to extra darkening of some areas of...

Hello, I am doing a pathology course this year, and while reading about reversible injury of cells (degeneration), i came across this part related to cloudy swelling of cells when injured: 'The cell is swollen and the cytoplasm appears granular.' I understand why cells swell, but can't get...

Hello, My book illustrates characteristics of different types of hypoxia in this table Arrows directed upwards indicate an increase and vice versa. I know what each type of hypoxia is, but I find a difficulty understand the change in venous PO2, O2 content and saturation of hemoglobin in...

Hello, I read that the rhythmicity of the heart increases due to decreasing in the permeability of SA node to K ions. I don't understand this mechanism, could anyone give me a simple explanation? Thanks!

The equation in the book is: ABP = SV * HR * TPR (Arterial blood pressure = stroke volume * Heart rate * total peripheral resistance) But I want to understand the physiological part not the marhematical one.

Hello, I came across this line in my textbook: "Total peripheral resistance (TPR) increases diastolic pressure more than systolic pressure." I don't understand how the peripheral resistance would increase the diastolic pressure more than the systolic pressure? Could some one explain that...

I don't think the list made anything clearer for me. It's written that iron deficiency is due to poor diet and chronic/acute blood loss. So still answers ii) and iii) are correct, right?

I came across this MCQ in my book, it says: Iron deficiency anemia... i) is of hypochromic, macrocytic type. ii) is commonly associated with chronic blood loss. iii) is common cause of anemia in infants below 1 year. iv) may increase the number of megaloblasts. v) is more common in males. I...

@DrDu Why?! It's the book which the biochemistry department in my college provide, and the book I'm supposed to do my final exam according to it. Could you please give a further explanation? And hopefully you explain for me where is the correct and wrong parts about Fischer formula of glucose!

Hello, my book shows this figure of Fischer formula of D-glucose I don't understand this figure, and I wonder why the upper carbon atoms in both the right and left formulas have 5 bonds. And from where comes this hedrogen atom in the upper left side of the figure (attached to alpha...

Hmm, sorry but still I don't understand the part of mRNA synthysis and short maturation period in the main passage I wrote in #1. Could you explain it for me, please?

Hi, I don't actually get the function of erythropoitin hormone in erythropoiesis, what is written in my textbook is that erythropoietin accelerates all steps of erythropoiesis as it stimulates mRNA synthysis, and also, it shortens the maturation time of RBCs in the bone marrow. I would like a...

@SciencewithDrJ You say that the T tubules and the sarcoplasmic reticulum are what transfer the action potential between the different myofibrils?

Hi all, My textbook says that the T tubules, which form an extensive network of transverse tubules that surround myofibrils, can carry the wave of action potential from the surface of the muscle fiber to the cell interior. Could you help me understand the sentence in bold because I'm not sure...

@Eman 5 You should know that iR, in this case, is the voltage drop between any branch in the circuit you drew, i.e. you can consider any branch of them to determine the voltage drop (potential difference) between the points a and b, because all branches in this circuit are connected to the...